Kylie Jenner: Khloe Kardashian and I Were "Sobbing on the Floor" Over Kim Kardashian's Engagement

Kylie Jenner says she and sister Khloe Kardashian were "sobbing on the floor" after Kanye West proposed to Kim Kardashian on Oct. 21Credit: Courtesy Khloe Kardashian

Kylie Jenner and Khloe Kardashian were so moved by Kanye West's surprise Oct. 21 proposal to Kim Kardashian that they, well, couldn't move. Calling into Ryan Seacrest's KIIS FM radio show on Tuesday, Nov. 12, the 16-year-old Keeping Up With the Kardashians star revealed that she and her 29-year-old half-sister were completely overwhelmed by emotion after West popped the question.

"When he proposed, everyone ran onto the field [at San Francisco's AT&T Park], and me and Khloe were literally sobbing and crying on the floor," Kylie told Seacrest, who executive produces the Kardashian family's reality show. "We couldn't even move. We were like, 'Our lives suck! We're so happy for them, though!'"

In fact, Khloe shared a picture of her and Kylie in tears just seconds after West's epic surprise. "Clearly @KylieJenner and I were having a moment," she captioned the photo, which was posted to Instagram on Oct. 23. "#TearsOfJoy #Sisters."

Asked whether she or her family had any idea what the rapper had planned, Kylie insisted to Seacrest that she was clueless. "No one knew," she told the American Idol host.

"We were on the plane, my sisters and all our friends and everything, on the way there to surprise Kim, and we just thought it was a party for her birthday," she recalled. "And Khloe's best friend Malika was like, 'I have a feeling he's going to propose. I have a feeling.' And we were like, 'No, no.'"

The only one who knew something was up was Kardashian matriarch Kris Jenner -- because West had called her up beforehand. "Mom knew," Kylie admitted. "But no one else."